Comparison of phosphate and phosphate-free detergent additives

　　For many years, sodium tripolyphosphate have been an important detergent additive in the field of synthetic detergent. It can improve the cleaning efficiency of surfactants, dispersion, emulsification, dirt compatibilization, chelation of hard calcium and magnesium ions, and generate soluble complex compound to prevent dirt redeposition, buffer alkalinity to improve the rewashing function.

　　At the same time, phosphorus also contributes to water eutrophication, the proliferation of algae and phytoplankton and marine red tide. It is the culprit responsible for water quality deterioration of rivers and lakes.

　　The shortcomings of phosphorus-containing detergent make people more inclined to non-phosphorus detergent. There are many non-phosphorus detergent additives, 4A zeolite, sodium metasilicate, crystalline layered sodium disilicate and modified sodium disilicate (MDS), etc.

　　Property comparisons of these additives are as follows:

　　① softened water property：

  　②water solubility：

       ③decontamination index：

        Comparing these parameters above, it’s obvious that MDS is more outstanding than the other phosphorus-free additives. Therefore, MDS is a new detergent additive in detergent industry.

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